CN103701526A - Multidimensional coding method for visible light communication - Google Patents
Multidimensional coding method for visible light communication Download PDFInfo
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Abstract
A multidimensional coding method for visible light communication comprises the following steps: arranging a plurality of LEDs, loading 41-bit Gothic codes on the LEDs for modulation to generate corresponding light signals to form a visible light communication multidimensional coding synchronization sub-frame; grouping a series of code streams, and uniquely mapping codons in each sub-group into PPM coding signals, wherein the grouped number is decided by the number of LED primary colors; loading the PPM coding signals on single primary color LEDs through the driving of the LEDs to generate corresponding single primary color LED light signals according to the PPM coding signals. Through the use of LEDs with red primary color, green primary color and blue primary color or other multiple primary colors, and the adoption of a pulse position modulation method, multidimensional coding visible light signals can be generated, a multidimensional coding code pattern is formed by adopting light signals, of different colors, modulated by the pulse position modulation method in a time space. The channel utilization rate of a spectrum is improved, and the implementation is simple.
Description
Technical field
The invention belongs to communication means technical field, relate to a kind of multidimensional coding method in visible light communication.
Background technology
Visible light communication utilizes light-emitting diode (LED) exactly, when illumination is provided, produces a kind of communication mode that the imperceptible high speed light and shade of human eye flash signal is carried out transmission of information, belongs in essence wireless light communication category.Therefore,, except having the advantage of general wireless light communication, also have without frequency spectrum authentication, to people's safety, the advantages such as green energy conservation.
The research of current visible light communication, mostly adopts OOK or VPPM modulation system, in conjunction with RZ code or NRZ code, white light LEDs is directly carried out to intensity modulated and carries out signal transmission.Such way is easy to realize, and still, frequency spectrum resource utilization rate is too low.Whole visible light frequency band is from 380nm to 780nm, and the channel capacity that can provide is up to 400TB, and if only intensity is modulated serious waste of resources.See just this point, IEEE802.15.7 group, in the suggestion of visible light communication, has also proposed the mode of CSK modulation, and it utilizes the speed-sensitive switch characteristic of LED, make it to send the light signal of different colours, thereby the light signal of different colours is encoded to realize communication.Implementation has been simplified in these coding methods often, and the sacrifice frequency resource of but take is cost; Or can effectively utilize frequency spectrum resource, but increase implementation complexity; This is worthless for mainly utilizing visible LED to realize the novel energy-conserving communication mode that not only throws light on but also communicate by letter.
Summary of the invention
The object of the present invention is to provide a kind of multidimensional coding method in visible light communication, the method not only realizes simply, and resource utilization is high.
Technical scheme of the present invention is, the multidimensional coding method in visible light communication comprises and each LED loaded the LED of a plurality of primary colours to 41 Goethe's codes and modulate, and makes it to produce corresponding light signal, forms the synchronous subframe of visible light communication multidimensional coding; By string of code flow point group, by the code word in each grouping unique be mapped to a PPM code signal; Wherein, the number of grouping is determined by the number of LED primary colours; PPM code signal is passed through to LED drive load to single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal.
Feature of the present invention is also:
PPM code signal is passed through to LED drive load to a plurality of primary-color LEDs, make it to produce corresponding single-primary-color LED light signal according to PPM code signal, finally in space, form the pattern of visible ray multidimensional coding, formed the multidimensional coding of a complete visible light communication.
Said process circulation, forms a data burst that effectively adopts visible ray multidimensional coding.
A synchronous subframe and a plurality of data burst form the Frame of visible ray multidimensional coding.
The present invention has following beneficial effect:
1, the present invention utilizes redness, green and three primary colors or other the multi-primary LED light such as blue, adopt pulse position modulation method, can produce the visible light signal of multidimensional coding, overcome information redundancy in traditional visible light communication process, the inefficient problem of resource profit.
2, the present invention adopt pulse position modulation different colours light signal time the aerial different patterns that the form multidimensional codings that form basic pattern, improved a kind of channel utilization of spectrum, coding is realized simple, transmission and detection overhead are little, can more effectively reduce the redundancy of communication, improve the level of resources utilization.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of the visible ray multidimensional coding of the multidimensional coding method in visible light communication of the present invention.
Fig. 2 is the synchronous subframe schematic diagram of the visible ray multidimensional coding of the multidimensional coding method in visible light communication of the present invention.
Fig. 3 is the two-dimensional encoded schematic diagram of visible ray of the multidimensional coding method in visible light communication of the present invention.
Fig. 4 is the visible ray multidimensional coding data burst schematic diagram of the multidimensional coding method in visible light communication of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Multidimensional coding method in visible light communication of the present invention, specifically comprises the following steps:
1. each LED is loaded to 41 Goethe's codes and modulate, make it to produce corresponding light signal, form the frame head of each frame signal.
2. by string of code flow point group, the PPM that is mapped to that the code word in each grouping is unique encodes.Wherein, the number of grouping is determined by the number of LED primary colours;
3. above-mentioned PPM code signal is passed through to LED drive load to single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to the PPM signal of telecommunication;
4. many primary-color LEDs complete the process described in 2 at synchronization, finally in space, form the visible ray pattern of multidimensional coding.This has just formed the multidimensional coding of a complete visible light communication.
5. repeating step 2 to 4, make it to form a data burst that effectively adopts visible ray multidimensional coding.
6. repeating step 1 to 5, makes it to form a Frame that adopts visible ray multidimensional coding.
Embodiment, the multidimensional coding method in visible light communication, selects red-green-blue LED as light source.First by encoder, produce 41 Goethe's coded signals, and it is loaded in the driving of three-primary color LED simultaneously, three primary colors LED light source is subject to modulation signal impact and produces 41 Goethe's code optical signals, thereby forms the synchronous subframe of visible light communication multidimensional coding.
Encoder is divided into three groups by the binary data code stream " 001001010100 " of input, produce accordingly " 0010 ", the 16PPM modulation signal of " 0101 " and " 0100 ", 3 16PPM modulation signals are loaded into respectively on corresponding single-primary-color LED, drive it to send corresponding 16PPM visible light signal.These signals have formed a secondary multidimensional beam pattern in space, thereby form a unique multidimensional coding pattern.So just realized a complete visible ray multidimensional coding.
According to the continuous renewal of data code flow, encoder constantly produces the 16PPM modulation signal of grouping, thus the corresponding visible ray multidimensional coding light signal pattern that produces LED.The pattern of several multidimensional codings has just formed the data burst of one group of visible ray multidimensional coding.1 synchronous subframe and several data burst composition data frames.
The frame structure of the visible ray multidimensional coding that coding method of the present invention forms, as shown in Figure 1, every frame comprises 1 synchronous subframe and several data bursts.
In traditional visible light communication, mostly adopt and do not design synchronous subframe.Realization is relatively simple like this, but when light signal is not when there is no for a long time the code word of height conversion, during such as continuous " 0 " code of transmission or " 1 " code, clock signal is easy to lose, thereby causes the follow-up error rate to increase suddenly.Had synchronous subframe, can be regular visible light signal be carried out synchronously, calibrates clock signal, thereby improves the reliability of visible light communication.
As shown in Figure 2, for the present invention is usingd RGB three-primary color LED as light source, the synchronous subframe that adopts 41 Goethe's codes to form.Each coloured light produces 41 Goethe's codes simultaneously, and unlabeled data frame is about to start send.Receiving terminal, when recognizing the information of 41 Goethe's codes, according to reception condition, is calibrated the information of each color, thereby carries out the preparation that receives data.
As shown in Figure 3, at a time, red LED adopts PPM modulation to send the code word of (0010), synchronization green LED also adopts PPM to send the code word of (0101), two-beam forms combination pattern in space, and detector is received respectively red and green light signal, according to the coding rule of primary colours PPM, search code table, solve corresponding code word.
As shown in Figure 4, take equally RGB three-primary color LED as example, to the LED of three kinds of colors of red, green, blue, adopt respectively PPM modulation to produce corresponding light beam simultaneously, thereby in space, form the PPM signal pattern of mixed-color light.During decoding, receiving terminal is sent to PIN photodetector by the light signal receiving after filter, transfers the signal of telecommunication to, by maximum likelihood criterion, determines signal form.Expanding to the situation of many primary lights, the code word of the multidimensional coding of the image construction that the PPM position of every kind of color is spatially combined into.It should be noted that because the frequency of each color is different, so every kind of color needed time when producing PPM pulse pattern is variant, need to be for adjusting respectively.
Claims (4)
1. the multidimensional coding method in visible light communication, is characterized in that: comprise the LED of a plurality of primary colours, each LED is loaded to 41 Goethe's codes and modulate, make it to produce corresponding light signal, form the synchronous subframe of visible light communication multidimensional coding; By string of code flow point group, by the code word in each grouping unique be mapped to a PPM code signal; Wherein, the number of grouping is determined by the number of LED primary colours; PPM code signal is passed through to LED drive load to single-primary-color LED, make it to produce corresponding single-primary-color LED light signal according to PPM code signal.
2. the multidimensional coding method in visible light communication as claimed in claim 1, it is characterized in that: PPM code signal is passed through to LED drive load to a plurality of primary-color LEDs, make it to produce corresponding single-primary-color LED light signal according to PPM code signal, finally in space, form the visible ray pattern of multidimensional coding, formed the multidimensional coding of a complete visible light communication.
3. the multidimensional coding method in visible light communication as claimed in claim 2, is characterized in that: described process circulation, forms a data burst that effectively adopts visible ray multidimensional coding.
4. the multidimensional coding method in visible light communication as claimed in claim 3, is characterized in that: a synchronous subframe and a plurality of data burst form the Frame of visible ray multidimensional coding.
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| CN104038283A (en) * | 2014-06-05 | 2014-09-10 | 桂林电子科技大学 | LED lighting communication system |
| CN105187732A (en) * | 2014-04-24 | 2015-12-23 | 北京国承万通信息科技有限公司 | Method and device for transmitting/acquiring information with visible light signals of different colors from light sources |
| CN105721064A (en) * | 2016-01-18 | 2016-06-29 | 桂林电子科技大学 | Coding and decoding method and device by combining channel coding and multidimensional pulse position modulation |
| CN107533765A (en) * | 2015-10-27 | 2018-01-02 | 广东虚拟现实科技有限公司 | Track the device of optical object, method and system |
| CN107567639A (en) * | 2015-07-09 | 2018-01-09 | 惠普发展公司，有限责任合伙企业 | Multidimensional circular symbol |
| CN107979414A (en) * | 2017-10-19 | 2018-05-01 | 南京邮电大学 | One kind collaboration coded modulation formula wireless light communication control method |
| CN108134630A (en) * | 2017-12-27 | 2018-06-08 | 南京邮电大学 | A kind of multi-user's MAC channel access methods based on hopping pattern |
| CN109889267A (en) * | 2018-09-28 | 2019-06-14 | 曹一宁 | Sending method, optical label and the barcode scanning equipment of encoded information based on optic communication |
| CN113037380A (en) * | 2021-03-23 | 2021-06-25 | 深圳市南科信息科技有限公司 | Visible light imaging communication method and system based on multi-channel PAM |
| CN114978310A (en) * | 2021-02-22 | 2022-08-30 | 广州视源电子科技股份有限公司 | Method and device for communication by using spectrum, processor and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105187732A (en) * | 2014-04-24 | 2015-12-23 | 北京国承万通信息科技有限公司 | Method and device for transmitting/acquiring information with visible light signals of different colors from light sources |
| CN104038283A (en) * | 2014-06-05 | 2014-09-10 | 桂林电子科技大学 | LED lighting communication system |
| CN107567639B (en) * | 2015-07-09 | 2021-09-10 | 惠普发展公司，有限责任合伙企业 | Multidimensional cyclic symbols |
| US10977466B2 (en) | 2015-07-09 | 2021-04-13 | Hewlett-Packard Development Company, L.P. | Multi-dimensional cyclic symbols |
| CN107567639A (en) * | 2015-07-09 | 2018-01-09 | 惠普发展公司，有限责任合伙企业 | Multidimensional circular symbol |
| CN107533765B (en) * | 2015-10-27 | 2020-11-27 | 广东虚拟现实科技有限公司 | Apparatus, method and system for tracking optical objects |
| US10709967B2 (en) | 2015-10-27 | 2020-07-14 | Guangdong Virtual Reality Technology Co., Ltd. | Apparatus, methods, and systems for tracking an optical object |
| CN107533765A (en) * | 2015-10-27 | 2018-01-02 | 广东虚拟现实科技有限公司 | Track the device of optical object, method and system |
| CN105721064A (en) * | 2016-01-18 | 2016-06-29 | 桂林电子科技大学 | Coding and decoding method and device by combining channel coding and multidimensional pulse position modulation |
| CN105721064B (en) * | 2016-01-18 | 2018-05-04 | 桂林电子科技大学 | The coding and decoding method and device of channel combined multidimensional pulse position modulation |
| CN107979414B (en) * | 2017-10-19 | 2019-08-27 | 南京邮电大学 | A kind of collaboration coded modulation formula wireless light communication control method |
| CN107979414A (en) * | 2017-10-19 | 2018-05-01 | 南京邮电大学 | One kind collaboration coded modulation formula wireless light communication control method |
| CN108134630B (en) * | 2017-12-27 | 2020-08-04 | 南京邮电大学 | Multi-user MAC channel access method based on hopping pattern |
| CN108134630A (en) * | 2017-12-27 | 2018-06-08 | 南京邮电大学 | A kind of multi-user's MAC channel access methods based on hopping pattern |
| CN109889267A (en) * | 2018-09-28 | 2019-06-14 | 曹一宁 | Sending method, optical label and the barcode scanning equipment of encoded information based on optic communication |
| CN114978310A (en) * | 2021-02-22 | 2022-08-30 | 广州视源电子科技股份有限公司 | Method and device for communication by using spectrum, processor and electronic equipment |
| CN114978310B (en) * | 2021-02-22 | 2024-02-20 | 广州视源电子科技股份有限公司 | Method, device, processor and electronic equipment for communication by using spectrum |
| CN113037380A (en) * | 2021-03-23 | 2021-06-25 | 深圳市南科信息科技有限公司 | Visible light imaging communication method and system based on multi-channel PAM |
| CN113037380B (en) * | 2021-03-23 | 2023-03-17 | 深圳市南科信息科技有限公司 | Visible light imaging communication method and system based on multi-channel PAM |
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